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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.regex.flavor.java;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.regex.RegexLanguage;
import com.oracle.truffle.regex.RegexOptions;
import com.oracle.truffle.regex.RegexSource;
import com.oracle.truffle.regex.tregex.buffer.CompilationBuffer;
import com.oracle.truffle.regex.tregex.parser.CaseFoldData;
import com.oracle.truffle.regex.tregex.parser.RegexFlavor;
import com.oracle.truffle.regex.tregex.parser.RegexLexer;
import com.oracle.truffle.regex.tregex.parser.RegexParser;
import com.oracle.truffle.regex.tregex.parser.RegexValidator;
import com.oracle.truffle.regex.tregex.parser.ast.RegexAST;

/**
 * An implementation of the java.util.regex.Pattern regex flavor.
 */
public final class JavaFlavor extends RegexFlavor {

    public static final JavaFlavor INSTANCE = new JavaFlavor();

    private JavaFlavor() {
        super(BACKREFERENCES_TO_UNMATCHED_GROUPS_FAIL | NESTED_CAPTURE_GROUPS_KEPT_ON_LOOP_REENTRY | EMPTY_CHECKS_ON_MANDATORY_LOOP_ITERATIONS | FAILING_EMPTY_CHECKS_DONT_BACKTRACK |
                        SUPPORTS_RECURSIVE_BACKREFERENCES);
    }

    @Override
    public String getName() {
        return "JavaUtilPattern";
    }

    @Override
    public RegexLexer createLexer(RegexSource source, CompilationBuffer compilationBuffer) {
        return new JavaRegexLexer(source, JavaFlags.parseFlags(source.getFlags()), compilationBuffer);
    }

    @Override
    public RegexParser createParser(RegexLanguage language, RegexSource source, CompilationBuffer compilationBuffer) {
        return JavaRegexParser.createParser(language, source, compilationBuffer);
    }

    @Override
    public RegexValidator createValidator(RegexLanguage language, RegexSource source, CompilationBuffer compilationBuffer) {
        return JavaRegexValidator.createValidator(source, compilationBuffer);
    }

    @Override
    public EqualsIgnoreCasePredicate getEqualsIgnoreCasePredicate(RegexAST ast) {
        return (a, b, altMode) -> getCaseFoldingAlgorithm(ast.getOptions(), altMode).getEqualsPredicate().test(a, b);
    }

    public static CaseFoldData.CaseFoldUnfoldAlgorithm getCaseFoldingAlgorithm(RegexOptions options, boolean isUnicodeCase) {
        if (isUnicodeCase) {
            if (options.getJavaJDKVersion() <= 24) {
                return CaseFoldData.CaseFoldUnfoldAlgorithm.JavaUnicode15;
            } else {
                return CaseFoldData.CaseFoldUnfoldAlgorithm.JavaUnicode16;
            }
        } else {
            return CaseFoldData.CaseFoldUnfoldAlgorithm.Ascii;
        }
    }

    @Override
    public CaseFoldData.CaseFoldAlgorithm getCaseFoldAlgorithm(RegexAST ast) {
        throw CompilerDirectives.shouldNotReachHere();
    }
}
